What you want to do is download The model from this link
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http://www.gta4-mods.com/vehicles/2012-lamborghini-aventador-lp700-4-epm-f11574
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Then take my sentinel.wtd Texture file and use it instead.

The file will be called lp700.WTF (the model) you can rename it to banshee.wft or change

both names blank.wft and blank.wtd to another vehicle name.

Hope you like the new skin more to come along as i progress! thank you